Accurate values of the freezing point of seawater are necessary for considering thermal processes at high latitudes and for relating the ice-water equilibrium to the thermodynamics of water in seawater at low temperature. Measurements of the freezing point of seawater at various salinities were made using three independent techniques. The results obtained by a super-cooling method were not reliable, whereas values based on a flow and an equilibration technique were indistinguishable....